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diff --git a/src/third_party/boost-1.69.0/boost/container/detail/variadic_templates_tools.hpp b/src/third_party/boost-1.69.0/boost/container/detail/variadic_templates_tools.hpp
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+++ b/src/third_party/boost-1.69.0/boost/container/detail/variadic_templates_tools.hpp
@@ -0,0 +1,163 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2008-2013. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_CONTAINER_DETAIL_VARIADIC_TEMPLATES_TOOLS_HPP
+#define BOOST_CONTAINER_DETAIL_VARIADIC_TEMPLATES_TOOLS_HPP
+
+#ifndef BOOST_CONFIG_HPP
+#  include <boost/config.hpp>
+#endif
+
+#if defined(BOOST_HAS_PRAGMA_ONCE)
+#  pragma once
+#endif
+
+#include <boost/container/detail/config_begin.hpp>
+#include <boost/container/detail/workaround.hpp>
+#include <boost/move/utility_core.hpp>
+
+#include <boost/container/detail/type_traits.hpp>
+#include <cstddef>   //std::size_t
+
+namespace boost {
+namespace container {
+namespace dtl {
+
+template<typename... Values>
+class tuple;
+
+template<> class tuple<>
+{};
+
+template<typename Head, typename... Tail>
+class tuple<Head, Tail...>
+   : private tuple<Tail...>
+{
+   typedef tuple<Tail...> inherited;
+
+   public:
+   tuple()
+      : inherited(), m_head()
+   {}
+
+   template<class U, class ...Args>
+   tuple(U &&u, Args && ...args)
+      : inherited(::boost::forward<Args>(args)...), m_head(::boost::forward<U>(u))
+   {}
+
+   // Construct tuple from another tuple.
+   template<typename... VValues>
+   tuple(const tuple<VValues...>& other)
+      : inherited(other.tail()), m_head(other.head())
+   {}
+
+   template<typename... VValues>
+   tuple& operator=(const tuple<VValues...>& other)
+   {
+      m_head = other.head();
+      tail() = other.tail();
+      return this;
+   }
+
+   typename add_reference<Head>::type head()             {  return m_head; }
+   typename add_reference<const Head>::type head() const {  return m_head; }
+
+   inherited& tail()             { return *this; }
+   const inherited& tail() const { return *this; }
+
+   protected:
+   Head m_head;
+};
+
+
+template<typename... Values>
+tuple<Values&&...> forward_as_tuple_impl(Values&&... values)
+{ return tuple<Values&&...>(::boost::forward<Values>(values)...); }
+
+template<int I, typename Tuple>
+struct tuple_element;
+
+template<int I, typename Head, typename... Tail>
+struct tuple_element<I, tuple<Head, Tail...> >
+{
+   typedef typename tuple_element<I-1, tuple<Tail...> >::type type;
+};
+
+template<typename Head, typename... Tail>
+struct tuple_element<0, tuple<Head, Tail...> >
+{
+   typedef Head type;
+};
+
+template<int I, typename Tuple>
+class get_impl;
+
+template<int I, typename Head, typename... Values>
+class get_impl<I, tuple<Head, Values...> >
+{
+   typedef typename tuple_element<I-1, tuple<Values...> >::type   Element;
+   typedef get_impl<I-1, tuple<Values...> >                       Next;
+
+   public:
+   typedef typename add_reference<Element>::type                  type;
+   typedef typename add_const_reference<Element>::type            const_type;
+   static type get(tuple<Head, Values...>& t)              { return Next::get(t.tail()); }
+   static const_type get(const tuple<Head, Values...>& t)  { return Next::get(t.tail()); }
+};
+
+template<typename Head, typename... Values>
+class get_impl<0, tuple<Head, Values...> >
+{
+   public:
+   typedef typename add_reference<Head>::type         type;
+   typedef typename add_const_reference<Head>::type   const_type;
+   static type       get(tuple<Head, Values...>& t)      { return t.head(); }
+   static const_type get(const tuple<Head, Values...>& t){ return t.head(); }
+};
+
+template<int I, typename... Values>
+typename get_impl<I, tuple<Values...> >::type get(tuple<Values...>& t)
+{  return get_impl<I, tuple<Values...> >::get(t);  }
+
+template<int I, typename... Values>
+typename get_impl<I, tuple<Values...> >::const_type get(const tuple<Values...>& t)
+{  return get_impl<I, tuple<Values...> >::get(t);  }
+
+////////////////////////////////////////////////////
+// Builds an index_tuple<0, 1, 2, ..., Num-1>, that will
+// be used to "unpack" into comma-separated values
+// in a function call.
+////////////////////////////////////////////////////
+
+template<std::size_t...> struct index_tuple{ typedef index_tuple type; };
+
+template<class S1, class S2> struct concat_index_tuple;
+
+template<std::size_t... I1, std::size_t... I2>
+struct concat_index_tuple<index_tuple<I1...>, index_tuple<I2...>>
+  : index_tuple<I1..., (sizeof...(I1)+I2)...>{};
+
+template<std::size_t N> struct build_number_seq;
+
+template<std::size_t N> 
+struct build_number_seq
+   : concat_index_tuple<typename build_number_seq<N/2>::type
+                       ,typename build_number_seq<N - N/2 >::type
+   >::type
+{};
+
+template<> struct build_number_seq<0> : index_tuple<>{};
+template<> struct build_number_seq<1> : index_tuple<0>{};
+
+}}}   //namespace boost { namespace container { namespace dtl {
+
+#include <boost/container/detail/config_end.hpp>
+
+#endif   //#ifndef BOOST_CONTAINER_DETAIL_VARIADIC_TEMPLATES_TOOLS_HPP